compy/transcoder/png.go
Andrew Gaul 49bceae2df Add unit tests for PNG and WebP
Also correct Content-Type when transcoding WebP.
2017-01-19 11:21:28 -08:00

33 lines
589 B
Go

package transcoder
import (
"github.com/barnacs/compy/proxy"
"github.com/chai2010/webp"
"image/png"
"net/http"
)
type Png struct{}
func (t *Png) Transcode(w *proxy.ResponseWriter, r *proxy.ResponseReader, headers http.Header) error {
img, err := png.Decode(r)
if err != nil {
return err
}
if SupportsWebP(headers) {
w.Header().Set("Content-Type", "image/webp")
options := webp.Options{
Lossless: true,
}
if err = webp.Encode(w, img, &options); err != nil {
return err
}
} else {
if err = png.Encode(w, img); err != nil {
return err
}
}
return nil
}